A01666 — SI Motion P1 (CU): Steady-state (static) 1 signal at the F-DI for safe acknowledgment

The message SI Motion P1 (CU): Steady-state (static) 1 signal at the F-DI for safe acknowledgment comes from the SI Motion monitoring in the Control Unit (P1). For the safe acknowledgment of internal SI Motion events, the drive uses a failsafe digital input (F-DI) — namely the one configured in p10006. When no acknowledgment is performed at this F-DI for safe acknowledgment, a steady logical 0 signal must be present there. If the F-DI instead stays at logical 1 for more than 10 seconds, the drive raises this alarm.

The monitoring is deliberate: it prevents an unintentional safety-relevant acknowledgment (or the "Internal Event Acknowledge" signal) if a wire breaks or one of the two digital inputs of the F-DI bounces. The manuals also list the same condition with the qualifier F, so depending on the drive's configuration it can additionally be signaled as a fault.

• The F-DI configured in p10006 for the safe acknowledgment of internal SI Motion events has carried a logical 1 signal for more than 10 seconds.
• A steady logical 0 signal is required at this F-DI whenever no acknowledgment is performed there for safe acknowledgment; the standing logical 1 violates this.
• The drive treats the standing 1 as a risk: if a wire breaks or one of the two digital inputs bounces, it could cause an unintentional safety-relevant acknowledgment (or the "Internal Event Acknowledge" signal).

1. Identify the F-DI in question: it is the failsafe digital input configured in p10006 for the safe acknowledgment of internal SI Motion events.
2. Check its signal state: the alarm reports that this input has been at logical 1 for more than 10 seconds, while a steady logical 0 is expected there when no safe acknowledgment is performed.
3. Carry out the remedy the manual gives: set the failsafe digital input (F-DI) to a logical 0 signal (p10006), i.e. remove the standing logical 1 at that input.

• p10006 — SI Motion acknowledgment internal event F-DI (processor 1): this parameter selects the failsafe digital input whose signal state is monitored for the safe acknowledgment of internal SI Motion events; it points to the input that must be brought back to a steady logical 0.

No acknowledgment is required for this alarm. The fix is at the signal itself: set the failsafe digital input (F-DI) configured in p10006 to a logical 0 signal, so that a steady logical 0 is present whenever no safe acknowledgment is performed there.